I have a 99 ram 1500 Sport with a 5.9. When I start the truck, everything runs fine. After about 10 min of warm up, it will sometimes start to run rough at idle. I will be sitting in the truck, and it is running fine, and then all of the sudden starts to run rough. It happens instantly just like that. If I turn the truck off and back on, that sometimes fixes it for a little bit, but it does happen again eventually. The only codes I get are for random missfire. Seems like it is running really rich when it starts to choke. I can hear the IAC sucking a lot of air too. Thanx in advance for any help you guys might have!

Ignition system should be fine. I have tuned up the truck several times since this problem has been occurring with no difference. I haven't checked the plenum gasket and will definitely try that. Fuel pressure is fine with the new fuel pump installed last summer. I installed a new IAC already and no change. I was wondering about the crank sensor......?

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